Add draft evolve implementation

1 files changed, 21 insertions, 1 deletions

diff --git a/CLI/rust/src/game_of_life/simulation/universe.rs b/CLI/rust/src/game_of_life/simulation/universe.rs
index 6e6c1d0..8c1965d 100644
--- a/CLI/rust/src/game_of_life/simulation/universe.rs
+++ b/CLI/rust/src/game_of_life/simulation/universe.rs
@@ -85,7 +85,7 @@ impl Universe {
     ///     .xxx.  |  .....  |  .....  |  .....  |  .....  |  .....  |
     ///     .....  |  .....  |  .xxx.  |  xxx..  |  xx..x  |  .....  |
     ///
-    pub(crate) fn neighbors(self, y: isize, x: isize) -> Vec<bool> {
+    fn neighbors(&self, y: isize, x: isize) -> Vec<bool> {
         vec![
             self[y - 1][x - 1],
             self[y - 1][x],
@@ -98,6 +98,26 @@ impl Universe {
         ]
     }
 
+    pub(crate) fn evolve(&mut self) -> &Self {
+        for row in 0..self.opts.height {
+            for col in 0..self.opts.width {
+                let living_neighbors = self
+                    .neighbors(row, col)
+                    .iter()
+                    .filter(|&c| *c == true)
+                    .count();
+                match self[row][col] {
+                    true if living_neighbors == 2 || living_neighbors == 3 => {
+                        self.future[row][col] = true
+                    }
+                    false if living_neighbors == 3 => self.future[row][col] = true,
+                    _ => self.future[row][col] = false,
+                }
+            }
+        }
+        self.current = self.future.clone();
+        self
+    }
 }
 
 #[cfg(test)]